Support pattern bindings within function signitures

This reuses our code to handle match-arams within MatchExpressions, we
resolve the pattern's type's and implicitly create types for that binding.
For code-generation we create a tmp var name for the name of the parameter
which is the base type and for the destructuring we reuse the same match
arm code to generate the implicit bindings to the parts of the structure

```c
__attribute__((cdecl))
i32 test::pattern_as_arg (const struct test::Pattern RSTPRM.0)
{
    i32 RUSTTMP.1;
  return RSTPRM.0.0;
}
```

Fixes #995

1 files changed, 62 insertions, 0 deletions

diff --git a/gcc/rust/backend/rust-compile-fnparam.cc b/gcc/rust/backend/rust-compile-fnparam.cc
new file mode 100644
index 0000000..b1b5523
--- /dev/null
+++ b/gcc/rust/backend/rust-compile-fnparam.cc
@@ -0,0 +1,62 @@
+// Copyright (C) 2020-2022 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include "rust-compile-fnparam.h"
+#include "rust-compile-pattern.h"
+
+#include "gimple-expr.h"
+
+namespace Rust {
+namespace Compile {
+
+void
+CompileFnParam::visit (HIR::StructPattern &pattern)
+{
+  // generate the anon param
+  tree tmp_ident = create_tmp_var_name ("RSTPRM");
+  std::string cpp_str_identifier = std::string (IDENTIFIER_POINTER (tmp_ident));
+
+  decl_type = ctx->get_backend ()->immutable_type (decl_type);
+  compiled_param
+    = ctx->get_backend ()->parameter_variable (fndecl, cpp_str_identifier,
+					       decl_type, locus);
+
+  // setup the pattern bindings
+  tree anon_param = ctx->get_backend ()->var_expression (compiled_param, locus);
+  CompilePatternBindings::Compile (&pattern, anon_param, ctx);
+}
+
+void
+CompileFnParam::visit (HIR::TupleStructPattern &pattern)
+{
+  // generate the anon param
+  tree tmp_ident = create_tmp_var_name ("RSTPRM");
+  std::string cpp_str_identifier = std::string (IDENTIFIER_POINTER (tmp_ident));
+
+  decl_type = ctx->get_backend ()->immutable_type (decl_type);
+  compiled_param
+    = ctx->get_backend ()->parameter_variable (fndecl, cpp_str_identifier,
+					       decl_type, locus);
+
+  // setup the pattern bindings
+  tree anon_param = ctx->get_backend ()->var_expression (compiled_param, locus);
+  CompilePatternBindings::Compile (&pattern, anon_param, ctx);
+}
+
+} // namespace Compile
+} // namespace Rust